<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
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</head>
<body>
    <button type="button" class="btn btn-primary">A</button>
    <button type="button" class="btn btn-success">B</button>
    <button type="button" class="btn btn-info">C</button>
    <div class="container">
        <div class="row">
            <div class="col-md-4">A</div>
            <div class="col-md-4">B</div>
            <div class="col-md-4">C</div>
        </div>
        <div class="row">
            <div class="col-md-6">D</div>
            <div class="col-md-6">E</div>
        </div>
    </div>
    <table class="table table-bordered table-striped table-hover">
        <thead>
            <tr>
                <th>F</th>
                <th>G</th>
                <th>H</th>
            </tr>
        </thead>
        <tbody>
            <tr>
                <td>I</td>
                <td>J</td>
                <td>K</td>
            </tr>
            <tr>
                <td class="info">L</td>
                <td>M</td>
                <td>N</td>
            </tr>
            <tr>
                <td>O</td>
                <td>P</td>
                <td>Q</td>
            </tr>
            <tr>
                <td>R</td>
                <td class="warning">S</td>
                <td>T</td>
            </tr>
        </tbody>
    </table>
</body>
</html>